Air conditioning system and air conditioning system control method

Abstract

The application provides an air conditioning system and an air conditioning system control method, the air conditioning system comprises a water supply pipeline, a return water pipeline, a water-cooled air conditioner connected between the water supply pipeline and the return water pipeline, and a controller, a first bypass pipeline and a second bypass pipeline are arranged between the water supply pipeline and the return water pipeline, a three-way valve is arranged on the first bypass pipeline, and a water pump for conveying return water in the return water pipeline to the water supply pipeline is arranged on the second bypass pipeline, the air conditioning system controls the flow of chilled water entering the air conditioning system by adjusting the opening degree of the three-way valve, and the pressure difference of the air conditioning system is maintained through the water pump, the return water of the air conditioning system is input into the water supply pipeline of the air conditioning system, the water supply temperature is adjusted, the water supply flow is ensured, the water supply temperature of the machine room is controlled to be higher than the dew point temperature of the machine room through the adjustment of the water supply temperature, the condensation of the machine room air conditioner is avoided, the latent heat of the machine room air conditioner and the energy consumption of the machine room humidification are reduced, and the overall energy consumption of the data center is reduced.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning systems, and more specifically, relates to an air conditioning system and an air conditioning system control method. Background Technology

[0002] Existing data centers use water-cooled server room air conditioning, which uses chilled water as the cooling source. The supply and return temperatures of the chilled water are 7℃ / 12℃, and the supply and return temperatures of the high-temperature chilled water are 12℃ / 17℃. The data center requires temperature and humidity control at 25℃ and 50%, with a dew point temperature of 13℃.

[0003] If the water supply temperature in the server room is lower than the dew point temperature, condensation will occur on the server room air conditioning. Condensation means that some of the cooling capacity of the chilled water is used for latent heat and not for absorbing heat from the server room, resulting in a waste of cooling capacity. It also causes a drop in humidity in the server room, requiring humidification to maintain relative humidity. Both of these drawbacks lead to energy waste and are detrimental to energy conservation and emission reduction. To reduce server room energy consumption, a water-cooled back-door (RDHx) cooling solution is adopted. The water-cooled back-doors are installed in the server racks and must not condense, so the supplied cooling water needs to be above the dew point temperature. Currently, the chilled water temperature in the server room is lower than the dew point temperature, so the existing solution uses a cooling capacity distribution control unit (CDU) to control the water supply temperature of the water-cooled back-doors through secondary heat exchange.

[0004] The CDU control room uses plate heat exchangers for internal circulation, and a temperature difference of 4–8°C is typically required between the primary and secondary sides of the water supply. The water-cooled backplate temperature is slightly higher than the dew point temperature. The CDU's heat exchange efficiency may cause the water supply temperature to be significantly higher than the dew point, thus reducing the water-cooled backplate's heat exchange efficiency. To ensure the water-cooled backplate temperature is slightly higher than the dew point (a lower supply water temperature), a lower primary side chilled water temperature is required. Both of these situations reduce the efficiency of the water cooling system and increase energy consumption. Summary of the Invention

[0005] The purpose of this invention is to provide an air conditioning system and an air conditioning system control method to solve the technical problems of low heat exchange efficiency and high energy consumption in existing water-cooled systems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: The first aspect of the present invention provides an air conditioning system, including a water supply pipeline, a return water pipeline, a water-cooled air conditioner connected between the water supply pipeline and the return water pipeline, and a controller. A first bypass pipeline and a second bypass pipeline are provided between the water supply pipeline and the return water pipeline. A three-way valve is provided on the first bypass pipeline, and a water pump for conveying return water in the return water pipeline to the water supply pipeline is provided on the second bypass pipeline.

[0007] The controller is used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is lower than the preset temperature, so that the water in the water supply pipeline flows into the return water pipeline through the first bypass pipeline, and the water pump pumps the water in the return water pipeline into the water supply pipeline through the second bypass pipeline.

[0008] The controller is also used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is higher than the preset temperature, so that the water supply in the water supply pipeline flows into the water-cooled air conditioner and the return water in the return water pipeline is discharged.

[0009] In one embodiment, the three-way valve is an electric regulating valve, a temperature sensor is installed on the water supply pipeline, a first water pressure sensor is installed on the water supply pipeline, a second water pressure sensor is installed on the return water pipeline, and the three-way valve, the water pump, the first water pressure sensor, and the second water pressure sensor are all electrically connected to the controller.

[0010] In one embodiment, the three-way valve is a three-way proportional regulating valve, and the controller is further configured to acquire the pressure difference between the water supply pipeline and the return pipeline, and the controller is further configured to adjust the speed of the water pump according to the pressure difference.

[0011] In one embodiment, the three-way valve is a three-way proportional regulating valve, and a check valve is provided on the second bypass pipeline.

[0012] In one embodiment, the preset temperature is higher than the dew point temperature of the computer room.

[0013] In one embodiment, the water-cooled air conditioner includes an in-row air conditioner and / or a water-cooled back door.

[0014] A second aspect of the present invention provides an air conditioning system control method for the aforementioned air conditioning system, the method comprising:

[0015] When the water temperature in the water supply pipeline is lower than the preset temperature, the opening of the three-way valve and the speed of the water pump are controlled so that the water in the water supply pipeline flows into the return water pipeline through the first bypass pipeline, and the water pump pumps the water in the return water pipeline into the water supply pipeline through the second bypass pipeline.

[0016] When the water temperature in the water supply pipeline is higher than the preset temperature, the opening degree of the three-way valve and the speed of the water pump are controlled so that the water supply in the water supply pipeline flows into the water-cooled air conditioner and the return water in the return water pipeline is discharged.

[0017] In one embodiment, the air conditioning system control method further includes:

[0018] When the first bypass pipeline is not connected and the water pump is turned off, the first water supply pressure on the water supply pipeline, the first water outlet pressure on the return pipeline, and the first difference between the first water supply pressure and the first water outlet pressure are obtained.

[0019] When the first bypass pipeline is connected and the three-way valve is opened, the second water supply pressure on the water supply pipeline and the second water outlet pressure on the return water pipeline, as well as the second difference between the second water supply pressure and the second water outlet pressure, are obtained.

[0020] Adjust the pump speed so that the first difference equals the second difference.

[0021] In one embodiment, when the water temperature in the water supply pipeline is lower than a preset temperature by less than a first preset value, the opening of the three-way valve is reduced to decrease the flow rate of water from the water supply pipeline into the water-cooled air conditioner.

[0022] In one embodiment, when the water temperature in the water supply pipeline is higher than a preset temperature but less than a second preset value, the opening of the three-way valve is increased to increase the flow rate of water supplied from the water supply pipeline into the water-cooled air conditioner.

[0023] The air conditioning system provided by the present invention includes a water supply pipeline, a return water pipeline, a water-cooled air conditioner connected between the water supply pipeline and the return water pipeline, and a controller. When the water temperature in the water supply pipeline is lower than a preset temperature, the controller controls the opening of the three-way valve and the speed of the water pump so that the water in the water supply pipeline flows into the return water pipeline through a first bypass pipeline. The water pump pumps the water in the return water pipeline into the water supply pipeline through a second bypass pipeline. When the water temperature in the water supply pipeline is higher than the preset temperature, the controller controls the opening of the three-way valve and the speed of the water pump so that the water in the water supply pipeline flows into the water-cooled air conditioner and the return water in the return water pipeline is discharged. This air conditioning system controls the flow rate of chilled water into the system by adjusting the opening of a three-way valve. At the same time, a water pump maintains the pressure difference in the air conditioning system, allowing the return water to be fed into the supply water pipeline. This regulates both the supply water temperature and the flow rate. By adjusting the supply water temperature, the system can keep the supply water temperature in the computer room above the dew point temperature, preventing condensation in the air conditioning system, reducing the latent heat of the air conditioning system and the energy consumption of humidification, and ultimately lowering the overall energy consumption of the data center. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram illustrating the water flow principle after the three-way valve of the air conditioning system is closed and the water pump is opened, as provided in an embodiment of the present invention.

[0028] Figure 4 This is a schematic diagram illustrating the water flow principle after the three-way valve of the air conditioning system is opened and the water pump is closed, as provided in an embodiment of the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] In the description of this invention, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0031] Furthermore, in this application, unless otherwise expressly specified and limited, the terms "connection," "linking," "fixing," "installation," etc., should be interpreted broadly. For example, they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise expressly limited, those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0032] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. It should be understood that the term "and / or" as used herein is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone.

[0034] The air conditioning system and air conditioning system control method provided by the present invention will be described in detail below with reference to specific embodiments.

[0035] Figure 1 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of an air conditioning system provided in an embodiment of the present invention. Figure 3 This is a schematic diagram illustrating the water flow principle after the three-way valve of the air conditioning system is closed and the water pump is opened, as provided in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating the water flow principle after the three-way valve of the air conditioning system is opened and the water pump is closed, as provided in an embodiment of the present invention. Please refer to [link / reference]. Figures 1-4 As shown, the first aspect of this embodiment provides an air conditioning system, including a water supply pipeline 1, a return water pipeline 2, a water-cooled air conditioner 3 connected in series between the water supply pipeline 1 and the return water pipeline 2, and a controller. A first bypass pipeline 4 and a second bypass pipeline 5 are provided between the water supply pipeline 1 and the return water pipeline 2. A three-way valve 6 is provided on the first bypass pipeline 4, and a water pump 7 for transporting return water in the return water pipeline 2 to the water supply pipeline 1 is provided on the second bypass pipeline 5.

[0036] The controller is used to control the opening degree of the three-way valve 6 and the speed of the water pump 7 when the water temperature of the water supply pipeline 1 is lower than the preset temperature, so that the water supply in the water supply pipeline 1 flows into the return water pipeline through the first bypass pipeline 4, and the water pump draws the drainage from the return water pipeline into the water supply pipeline through the second bypass pipeline.

[0037] The controller is also used to control the opening degree of the three-way valve 6 and the speed of the water pump 7 when the water temperature of the water supply pipeline 1 is higher than the preset temperature, so that the water supply in the water supply pipeline 1 flows into the water-cooled air conditioner 3 and the return water on the return water pipeline 2 is discharged.

[0038] Existing data centers use water-cooled air conditioning, which uses chilled water as the cooling source. For example, the supply and return water temperatures of high-temperature chilled water are 12 / 17℃. Data centers require temperature and humidity control at 25℃ and 50%, with a dew point temperature of 13℃. In this embodiment, water supply pipe 1 is used to supply chilled water to the data center air conditioning, and return water pipe 2 is used for returning water after cooling by the data center air conditioning. This embodiment does not impose any special restrictions on the material and size of the water supply pipe 1 and the return water pipe 2.

[0039] In this embodiment, the water-cooled air conditioner 3 is connected between the water supply pipe 1 and the return water pipe 2. This embodiment does not impose any particular limitation on the specific form of the water-cooled air conditioner 3. For example, the water-cooled air conditioner includes an inter-row air conditioner 31 and / or a water-cooled back door 32.

[0040] In this embodiment, a first bypass pipe 4 and a second bypass pipe 5 are provided between the water supply pipe 1 and the return water pipe 2. A three-way valve 6 is installed on the first bypass pipe 4. In this embodiment, the second bypass pipe 5 is located on the side of the water supply pipe 1 and the return water pipe 2 closer to the water-cooled air conditioner 3, while the first bypass pipe 4 is located on the side of the water supply pipe 1 and the return water pipe 2 farther away from the water-cooled air conditioner 3. When the three-way valve 6 is closed, the return water pipe 2 is closed, and the water supply pipe 1 and the return water pipe 2 are connected. When the three-way valve 6 is open, the return water pipe 2 is open, and the water supply pipe 1 and the return water pipe 2 are not connected. This embodiment does not impose any particular limitation on the specific form of the three-way valve 6. A water pump 7 for transporting water from the return water pipe 2 to the water supply pipe is installed on the second bypass pipe 5. In this embodiment, the specific form of the water pump 7 is not imposed. In this embodiment, a bypass valve 8 is also provided on the side of the first bypass pipeline 4 near the water supply pipeline 1 to facilitate the maintenance of the three-way valve 6.

[0041] The existing water-cooled backplate is installed in the server rack and requires no condensation, so the supplied chilled water needs to be above the dew point temperature. Currently, the chilled water in the server room is below the dew point temperature. The existing solution uses a Cooling Distribution Control Unit (CDU) to control the supply water temperature of the water-cooled backplate through secondary heat exchange. The CDU uses a plate heat exchanger to control the heat exchange between the primary-side chilled water and the secondary-side circulating cooling water in the server room, thus keeping the secondary-side circulating cooling water above the server room's dew point temperature. The CDU controls the internal circulation using a plate heat exchanger, and a temperature difference of 4-8°C is typically required between the primary and secondary sides. The water-cooled backplate temperature is slightly above the dew point temperature. The CDU's heat exchange efficiency may result in the water-cooled backplate supply temperature being significantly higher than the dew point temperature, thus reducing the heat exchange efficiency of the water-cooled backplate. To ensure the water-cooled backplate temperature is slightly above the dew point (a lower supply water temperature), a lower primary-side chilled water temperature is required. Both of these situations reduce the efficiency of the water cooling system and increase energy consumption.

[0042] For example, in this embodiment, when the water temperature in the water supply pipeline 1 is lower than the preset temperature, the controller controls the opening of the three-way valve 6 and the rotation speed of the water pump 7, so that the water supply in the water supply pipeline 1 flows into the return water pipeline 2 through the first bypass pipeline 4, and the water pump 7 pumps the return water on the return water pipeline 2 into the water supply pipeline 1 through the second bypass pipeline 5. The controller also controls the opening of the three-way valve 6 and the rotation speed of the water pump 7 when the water temperature in the water supply pipeline 1 is higher than the preset temperature, so that the water supply in the water supply pipeline 1 flows into the water-cooled air conditioner, and the return water on the return water pipeline 2 is discharged. In this embodiment, the water supply temperature is the water supply temperature near the water-cooled air conditioner on the water supply pipeline 1. The preset temperature in this embodiment is higher than the dew point temperature; for example, the preset temperature in this embodiment is 2°C higher than the dew point temperature.

[0043] This embodiment, by adjusting the water supply temperature on water supply pipe 1, can control the water supply temperature of the water-cooled air conditioner 3 to be higher than the dew point temperature of the computer room, avoiding condensation on the water-cooled air conditioner, reducing the latent heat of the computer room air conditioner, reducing the energy consumption of humidification in the computer room, and lowering the overall energy consumption of the data center computer room. The water supply temperature on water supply pipe 1 of this air conditioning system can be the same as the chilled water supply temperature, reducing the thermal resistance loss (temperature difference) caused by using plate heat exchangers, and improving the heat exchange efficiency of natural cooling of the data center computer room's chilled water. At the same time, reducing the number of plate heat exchangers in the system can lower the overall system cost.

[0044] The air conditioning system provided in this embodiment includes a water supply pipeline, a return pipeline, a water-cooled air conditioner connected between the water supply pipeline and the return pipeline, and a controller. The controller is used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is lower than a preset temperature, so that the water in the water supply pipeline flows into the return pipeline through the first bypass pipeline, and the water pump pumps the water in the return pipeline into the water supply pipeline through the second bypass pipeline. The controller is also used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is higher than the preset temperature, so that the water in the water supply pipeline flows into the water-cooled air conditioner, and the return water in the return pipeline is discharged. This air conditioning system controls the flow rate of chilled water into the system by adjusting the opening of a three-way valve. At the same time, a water pump maintains the pressure difference in the air conditioning system, allowing the return water to be fed into the supply water pipeline. This regulates both the supply water temperature and the flow rate. By adjusting the supply water temperature, the system can keep the supply water temperature in the computer room above the dew point temperature, preventing condensation in the air conditioning system, reducing the latent heat of the air conditioning system and the energy consumption of humidification, and ultimately lowering the overall energy consumption of the data center.

[0045] In one specific embodiment, the three-way valve 6 is an electrically adjustable valve. A temperature sensor 9 and a first water pressure sensor 10 are installed on the water supply pipeline 1, and a second water pressure sensor 11 is installed on the return water pipeline 2. The three-way valve 6, the water pump 7, the first water pressure sensor 10, and the second water pressure sensor 11 are all electrically connected to the controller. In this embodiment, the temperature sensor 9 is used to measure the water temperature supplied to the water supply pipeline 1 near the water-cooled air conditioner 3. In this embodiment, the first water pressure sensor 10 is used to measure the inlet water pressure on the water supply pipeline near the water-cooled air conditioner 3. In this embodiment, the second water pressure sensor 11 is used to measure the return water pressure on the return water pipeline 2 near the water-cooled air conditioner 3.

[0046] Furthermore, the controller is used to obtain the pressure difference between the water supply pipeline 1 and the return pipeline 2, and the controller is also used to adjust the speed of the water pump 7 according to the pressure difference.

[0047] For example, when the air conditioning system of this embodiment starts, the three-way valve 6 is closed, the chilled water bypass valve 8 is closed, and the water pump 7 is in a stopped state. The chilled water in the supply water pipeline 1 is directly supplied to the water-cooled air conditioner 3 in the computer room. At this time, the pressure difference between the supply water pipeline 1 and the return water pipeline 2 is ΔP, which is set as the control pressure difference. When the supply water temperature of the supply water pipeline 1 is lower than the preset temperature by more than a certain value, the chilled water bypass valve 8 opens, and the controller controls the three-way valve 6 to close, so that the chilled water in the supply water pipeline 1 enters the first bypass pipeline 4. At the same time, the water pump starts, and the water pump 7 pumps the return water in the return water pipeline 2 into the supply water pipeline 1 through the second bypass pipeline 5. The controller adjusts the water pump speed according to the pressure difference ΔP1 between the supply water pipeline 1 and the return water pipeline 2, so that the supply and return water pressure difference ΔP1 of the air conditioning system is equal to the control pressure difference ΔP. At this time, the system enters the self-circulation mode.

[0048] For example, when the water temperature of the water supply pipe 1 is higher than the preset temperature by a certain value, the controller controls the three-way valve 6 to be fully opened, the water pump 7 to be turned off, the chilled water in the water supply pipe 1 enters the water-cooled air conditioner 3 in the machine room, and the return water of the water-cooled air conditioner 3 no longer enters the water supply pipe 1, thereby reducing the inlet water temperature of the water-cooled air conditioner 3. At this time, the system enters the external circulation mode.

[0049] In this embodiment, the three-way valve 6 is a three-way proportional regulating valve. When the water temperature in the water supply pipeline 1 approaches the preset temperature, the controller adjusts the opening of the three-way valve 6, allowing some of the chilled water in the water supply pipeline to enter the water-cooled air conditioner 3 in the computer room, while some of the chilled water in the water supply pipeline 1 returns to the return water pipeline 2 through the first bypass pipeline 4. At the same time, the controller adjusts the speed of the water pump 7 so that the pressure difference between the supply and return water of the air conditioning system, ΔP2, is equal to the set system pressure difference, ΔP. At this time, the air conditioning system enters the mixing mode.

[0050] Furthermore, a check valve 12 is installed on the second bypass pipe 5. By installing the check valve 12 on the second bypass pipe 5, the water supplied from the water supply pipe 1 is prevented from flowing into the return water pipe 2 through the second bypass pipe 5, thus avoiding energy waste.

[0051] This embodiment controls the flow rate of chilled water from the supply line into the air conditioning system by adjusting the opening of the three-way valve using a controller. The controller maintains the pressure differential of the air conditioning system by adjusting the pump speed, directing return water (hot water) from the air conditioning system's return line into the supply line. This balances supply water temperature and flow rate. By regulating the supply water temperature, this air conditioning system ensures that the water-cooled air conditioner's supply temperature is higher than the dew point temperature of the computer room, reducing chilled water condensation and avoiding safety hazards caused by condensation. It also reduces latent heat loss in the chilled water system and the energy consumption of humidification in the computer room, thereby lowering the overall energy consumption of the data center. The supply water temperature regulation is achieved through mixing, allowing the minimum supply water temperature to be the same as the chilled water temperature in the supply line. This reduces thermal resistance loss (temperature difference) associated with plate heat exchangers, improves the heat exchange efficiency of natural cooling in the data center's water-cooled air conditioning system, reduces the number of plate heat exchangers in the system, and lowers the overall system cost.

[0052] The second aspect of this embodiment provides an air conditioning system control method for the air conditioning system described in the above embodiment. The air conditioning system includes a water supply pipe 1, a return water pipe 2, a water-cooled air conditioner 3 bridging the water supply pipe 1 and the return water pipe 2, and a controller. A first bypass pipe 4 and a second bypass pipe 5 are provided between the water supply pipe 1 and the return water pipe 2. A three-way valve 6 is provided on the first bypass pipe 4, and a water pump 7 for transporting water from the return water pipe 2 to the water supply pipe 1 is provided on the second bypass pipe 5. The air conditioning system control method includes:

[0053] When the water temperature in the water supply pipeline 1 is lower than the preset temperature, the opening of the three-way valve 6 and the speed of the water pump 7 are controlled so that the water in the water supply pipeline 1 flows into the return water pipeline 2 through the first bypass pipeline 4, and the water pump 7 pumps the water on the return water pipeline 2 into the water supply pipeline 1 through the second bypass pipeline 5.

[0054] When the water temperature in the water supply pipeline 1 is higher than the preset temperature, the opening degree of the three-way valve 6 and the speed of the water pump 7 are controlled so that the water supply in the water supply pipeline 1 flows into the water-cooled air conditioner 3 and the return water in the return water pipeline 2 is discharged.

[0055] In this embodiment, the closing degree of the three-way valve 6 is determined by the supply water temperature and the preset temperature, and the opening of the water pump 7 is also determined by the supply water temperature and the preset temperature. In this embodiment, the preset temperature is set in advance by the technicians. The preset temperature is higher than the dew point temperature of the computer room. For example, the preset temperature is 2°C higher than the dew point temperature of the computer room.

[0056] In this embodiment, when the water supply temperature of the water supply pipeline 1 is lower than the preset temperature by more than a certain value, the three-way valve 6 is closed and the water pump 7 is turned on. The chilled water in the water supply pipeline 1 enters the first bypass pipeline 4, and the chilled water in the water supply pipeline 1 no longer enters the water-cooled air conditioner, thereby increasing the inlet water temperature of the water-cooled air conditioner. This controls the water supply temperature of the computer room to be higher than the dew point temperature of the computer room, avoiding safety hazards caused by condensation. At the same time, it reduces the condensation of chilled water, reduces the latent heat loss of the chilled water system, and reduces the energy consumption of the computer room humidification.

[0057] When the water temperature in the water supply pipeline 1 exceeds a certain preset temperature, the three-way valve 6 is opened, and the water pump 7 is shut off. This allows the water in the water supply pipeline 1 to flow into the water-cooled air conditioner 3, while the return water in the return water pipeline 2 is discharged. The return water from the water-cooled air conditioner 3 no longer enters the water supply pipeline 1, thereby reducing the inlet water temperature of the water-cooled air conditioner 3. In this embodiment, the minimum inlet water temperature of the water-cooled air conditioner 3 can be the same as the chilled water supply temperature in the water supply pipeline 1, reducing the thermal resistance loss caused by using plate heat exchangers and improving the heat exchange efficiency of water-side natural cooling in the data center. Simultaneously, reducing the number of plate heat exchangers in the system reduces the overall system cost.

[0058] This air conditioning system control method controls the flow rate of chilled water into the air conditioning system by adjusting the opening of the three-way valve. At the same time, it maintains the pressure difference of the air conditioning system through a water pump, and inputs the return water of the air conditioning system into the supply water pipeline of the air conditioning system. This not only regulates the supply water temperature but also ensures the supply water flow rate. By adjusting the supply water temperature, the supply water temperature of the computer room can be controlled to be higher than the dew point temperature of the computer room, avoiding condensation of the air conditioning in the computer room, reducing the latent heat of the air conditioning in the computer room and the energy consumption of humidification in the computer room, and reducing the overall energy consumption of the data center.

[0059] Furthermore, when the first bypass pipe 4 is not open and the water pump 7 is turned off, the first water supply pressure on the water supply pipe 1, the first water outlet pressure on the return water pipe 2, and the first difference between the first water supply pressure and the first water outlet pressure are obtained.

[0060] When the first bypass pipe 4 is open and the three-way valve 6 is opened, the second water supply pressure on the water supply pipe 1 and the second water outlet pressure on the return water pipe 2, as well as the second difference between the second water supply pressure and the second water outlet pressure, are obtained.

[0061] Adjust the speed of the water pump 7 so that the first difference is equal to the second difference.

[0062] In this embodiment, the water pump 7 is an adjustable-speed water pump. Water pressure sensors are installed on both the supply water pipe 1 and the return water pipe 2. A bypass valve 8 is installed on the first bypass pipe 5. When the air conditioning system in this embodiment starts, the bypass valve 8 on the first bypass pipe 4 is closed, the three-way valve 6 is closed, and the water pump 7 is turned off. The chilled water on the supply water pipe 1 directly supplies water to the water-cooled air conditioner 3 in the computer room. At this time, the first difference between the first supply water pressure and the first outlet water pressure is the control pressure differential of the air conditioning system. When the supply water temperature in the supply water pipe 1 is lower than the preset temperature, the water pump 7 turns on. The supply water in the supply water pipe 1 flows into the return water pipe 2 through the first bypass pipe 4. The water pump 7 then draws the return water from the return water pipe 2 into the supply water pipe 1 through the second bypass pipe 5. At this time, the speed of the water pump 7 is adjusted according to the second difference to make the second difference equal to the first difference, ensuring the operation of the air conditioning system.

[0063] In the air conditioning system control method of this embodiment, when the water temperature of the water supply pipe 1 is close to the preset temperature, the opening of the three-way valve 6 is adjusted so that part of the chilled water in the water supply pipe 1 enters the water-cooled air conditioner in the computer room, and part of the chilled water in the water supply pipe 1 returns to the chilled water return pipe 2 through the first bypass pipe 4. At the same time, the speed of the water pump 7 is adjusted so that the pressure difference between the air conditioning system water supply pipe 1 and the return pipe 2 is equal to the set system pressure difference. At this time, the system enters the mixing mode.

[0064] For example, when the water temperature in the water supply pipeline 1 is lower than the preset temperature by less than a first preset value, the controller controls the opening of the three-way valve 6 to decrease, thereby reducing the flow rate of water supplied from the water supply pipeline 1 into the water-cooled air conditioner.

[0065] When the water temperature in the water supply pipeline is higher than the preset temperature but less than the second preset value, the controller controls the opening of the three-way valve to increase the flow rate of water from the water supply pipeline into the water-cooled air conditioner.

[0066] For example, the first preset value in the above embodiment can be less than 5°C, and the second preset value can be less than 5°C. Those skilled in the art can preset these values ​​in advance according to actual conditions.

[0067] The air conditioning system control method of this embodiment includes: when the water supply temperature in the water supply pipeline is lower than the preset temperature, controlling the opening of the three-way valve and the speed of the water pump, so that the water supply in the water supply pipeline flows into the return water pipeline through the first bypass pipeline, and the water pump pumps the water in the return water pipeline into the water supply pipeline through the second bypass pipeline; when the water supply temperature in the water supply pipeline is higher than the preset temperature, controlling the opening of the three-way valve and the speed of the water pump, so that the water supply in the water supply pipeline flows into the water-cooled air conditioner, and the return water in the return water pipeline is discharged. This air conditioning system control method can control the water supply temperature in the computer room to be higher than the dew point temperature of the computer room, avoiding condensation of the computer room air conditioner, reducing the latent heat loss of the computer room air conditioner, reducing the energy consumption of the computer room humidification, and thus reducing the overall energy consumption of the data center. The water supply temperature regulation of this air conditioning system is achieved by mixing water, and the minimum water supply temperature can be the same as the chilled water supply temperature, reducing the thermal resistance loss (temperature difference) caused by heat exchange using plate heat exchangers, and improving the heat exchange efficiency of water-side natural cooling in the data center. At the same time, reducing the number of circuit board replacements in the system can lower the overall system cost.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioning system, characterized in that: It includes a water supply pipeline, a return pipeline, a water-cooled air conditioner bridging the water supply pipeline and the return pipeline, and a controller. A first bypass pipeline and a second bypass pipeline are provided between the water supply pipeline and the return pipeline. A three-way valve is provided on the first bypass pipeline, and a water pump for transporting return water from the return pipeline to the water supply pipeline is provided on the second bypass pipeline. The controller is used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is lower than the preset temperature, so that the water in the water supply pipeline flows into the return water pipeline through the first bypass pipeline, and the water pump pumps the water in the return water pipeline into the water supply pipeline through the second bypass pipeline. The controller is also used to control the opening degree of the three-way valve and the speed of the water pump when the water temperature in the water supply pipeline is higher than a preset temperature, so that the water supply in the water supply pipeline flows into the water-cooled air conditioner and the return water in the return water pipeline is discharged; wherein, The preset temperature is higher than the dew point temperature of the computer room.

2. The air conditioning system according to claim 1, characterized in that: The three-way valve is an electric regulating valve. A temperature sensor is installed on the water supply pipeline, a first water pressure sensor is installed on the water supply pipeline, and a second water pressure sensor is installed on the return water pipeline. The three-way valve, the water pump, the first water pressure sensor, and the second water pressure sensor are all electrically connected to the controller.

3. The air conditioning system according to claim 1, characterized in that: The three-way valve is a three-way proportional regulating valve. The controller is also used to obtain the pressure difference between the water supply pipeline and the return pipeline, and the controller is also used to adjust the speed of the water pump according to the pressure difference.

4. The air conditioning system according to claim 1, characterized in that: The three-way valve is a three-way proportional regulating valve, and a check valve is installed on the second bypass pipeline.

5. The air conditioning system according to any one of claims 1-4, characterized in that: The water-cooled air conditioner includes in-row air conditioners and / or water-cooled back doors.

6. An air conditioning system control method, used in the air conditioning system according to any one of claims 1-5, characterized in that, The method includes: When the water temperature in the water supply pipeline is lower than the preset temperature, the opening of the three-way valve and the speed of the water pump are controlled so that the water in the water supply pipeline flows into the return water pipeline through the first bypass pipeline, and the water pump pumps the water in the return water pipeline into the water supply pipeline through the second bypass pipeline. When the water temperature in the water supply pipeline is higher than a preset temperature, the opening degree of the three-way valve and the speed of the water pump are controlled so that the water supply in the water supply pipeline flows into the water-cooled air conditioner, and the return water in the return water pipeline is discharged; wherein, The preset temperature is higher than the dew point temperature of the computer room.

7. The air conditioning system control method according to claim 6, characterized in that, Also includes: When the first bypass pipeline is not connected and the water pump is turned off, the first water supply pressure on the water supply pipeline, the first water outlet pressure on the return pipeline, and the first difference between the first water supply pressure and the first water outlet pressure are obtained. When the first bypass pipeline is connected and the three-way valve is opened, the second water supply pressure on the water supply pipeline and the second water outlet pressure on the return water pipeline, as well as the second difference between the second water supply pressure and the second water outlet pressure, are obtained. Adjust the pump speed so that the first difference equals the second difference.

8. The air conditioning system control method according to claim 7, characterized in that: When the water temperature in the water supply pipeline is lower than the preset temperature by less than a first preset value, the opening of the three-way valve is reduced to decrease the flow rate of water from the water supply pipeline into the water-cooled air conditioner.

9. The air conditioning system control method according to claim 7, characterized in that: When the water temperature in the water supply pipeline is higher than the preset temperature but less than the second preset value, the opening of the three-way valve is increased to increase the flow rate of water from the water supply pipeline into the water-cooled air conditioner.

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